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The design of a communication system consists of several steps. At the highest level, the system (usually known as RF system) performance is tackled. Here the BER and signal levels, data rate, and channel models with noise and noise figure are considered. The next is a high level system simulation, usually using a high level language such as C or Fortran, or Matlab or a block system simulator. Here, Algorithms for acquisition, tracking, and detection are developed. After high level description, the process of system architecture and implementation is carried out. This is usually referred to as the Design process. Finally, circuits or prototypes are made and the system is tested..